﻿if (typeof Object.assign != 'function') {
	// Must be writable: true, enumerable: false, configurable: true
	Object.defineProperty(Object, "assign", {
		value: function assign(target, varArgs) { // .length of function is 2
			'use strict';
			if (target == null) { // TypeError if undefined or null
				throw new TypeError('Cannot convert undefined or null to object');
			}

			let to = Object(target);

			for (var index = 1; index < arguments.length; index++) {
				var nextSource = arguments[index];

				if (nextSource != null) { // Skip over if undefined or null
					for (let nextKey in nextSource) {
						// Avoid bugs when hasOwnProperty is shadowed
						if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
							to[nextKey] = nextSource[nextKey];
						}
					}
				}
			}
			return to;
		},
		writable: true,
		configurable: true
	});
}
if (!Array.prototype.findIndex) {
	Object.defineProperty(Array.prototype, 'findIndex', {
		value: function (predicate) {
			// 1. Let O be ? ToObject(this value).
			if (this == null) {
				throw new TypeError('"this" is null or not defined');
			}

			var o = Object(this);

			// 2. Let len be ? ToLength(? Get(O, "length")).
			var len = o.length >>> 0;

			// 3. If IsCallable(predicate) is false, throw a TypeError exception.
			if (typeof predicate !== 'function') {
				throw new TypeError('predicate must be a function');
			}

			// 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
			var thisArg = arguments[1];

			// 5. Let k be 0.
			var k = 0;

			// 6. Repeat, while k < len
			while (k < len) {
				// a. Let Pk be ! ToString(k).
				// b. Let kValue be ? Get(O, Pk).
				// c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
				// d. If testResult is true, return k.
				var kValue = o[k];
				if (predicate.call(thisArg, kValue, k, o)) {
					return k;
				}
				// e. Increase k by 1.
				k++;
			}

			// 7. Return -1.
			return -1;
		}
	});
}
if (!Array.prototype.find) {
	Array.prototype.find = function (callback) {
		return callback && (this.filter(callback) || [])[0];
	};
}